Refrigerant Pipe; Air Evacuation; Leakage Test - Airwell DDM012 Manuel D'installation

4. REFRIGERANT PIPING WORK

4.3 REFRIGERANT PIPE

Model
Liquid Side
012 Φ6.35mm
018 Φ6.35mm
024 Φ9.52mm
036/048 Φ9.52mm
060 Φ9.52mm
NOTE
When the pipe length is over 5m, the additional refrigerant should be added according to the
piping length.

4.4 AIR EVACUATION

Connect the charge hose from the manifold gauge to the service port of the gas side packed valve.
Connect the charge hose to the port of the vacuum pump.
Fully open the handle Lo of manifold gauge.
Operate the vacuum pump to evacuate air from the system until 76cmHg.
Close the handle Lo of manifold gauge.
Fully open the valve stem of the packed valves.
Remove the charging hose from the service port.
Securely tighten caps of packed valve.

4.5 LEAKAGE TEST

After the piping work is finished, make sure to check the connection part of each refrigerant pipe and confirm
that there is no gas leak by applying soapy water to them or by using a leak detector specific for HFC refrigerants.
Refer below picture for illustration.
Check-point of outdoor unit
A: Low pressure stop valve
C& D: Indoor unit flare nuts
Allowable
Gas Side
pipe length (m)
Φ9.52mm 25
Φ12.7mm 30
Φ15.88mm 40
Φ15.88mm 50
Φ15.88mm 65
Manifold valve
Compound gauge Pressure meter
-76 cmHg
Handle Lo
Charge hose
Packed valve
Check-point of indoor unit
Max. Height Charge less
difference (m) length (m)
10
20
20
25
30
Handle Hi
Charge hose
Vacuum pump
D
B
C
A
B: High pressure stop valve
Additional charge
per meter (R32)
12 g/m
5
12 g/m
5
24 g/m
5
24 g/m
5
24 g/m
5
GB-16